Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...81..683t&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 81, no. 2, Aug. 1992, p. 683-714.
Astronomy and Astrophysics
Astrophysics
25
Andromeda Galaxy, Cataclysmic Variables, Galactic Bulge, Novae, Stellar Spectrophotometry, White Dwarf Stars, Abundance, Charge Coupled Devices, Nitrogen, Stellar Spectra
Scientific paper
The study reports results from a three-year (1987-1989) spectroscopic and photometric survey of novae in M31's bulge, the first comprehensive study of novae outside the Galactic and Magellanic Cloud systems. Nine novae were detected and monitored, and their spectra cover a range of outburst states from early decline to the early nebular phases. Broad agreement in spectral morphology and evolution is found with Galactic novae. In the present sample, and in a sample of four M31 nova spectra taken in 1983, no fast, violent outbursts associated with nova systems containing an ONeMg white dwarf were detected. Three novae in the sample were observed on succeeding nights during the transition phase of their evolution. Extraordinary variations in the nightly strengths of He I, He II, N II, forbidden O III, and particularly the N III lines were discovered.
Shafter Allen W.
Tomaney Austin B.
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